Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*3^j.

Terms

a(0) =1a(1) =7a(2) =3a(3) =49a(4) =42a(5) =9a(6) =343a(7) =441a(8) =189a(9) =27a(10) =2401a(11) =4116a(12) =2646a(13) =756a(14) =81a(15) =16807a(16) =36015a(17) =30870a(18) =13230a(19) =2835a(20) =243a(21) =117649a(22) =302526a(23) =324135a(24) =185220a(25) =59535a(26) =10206a(27) =729a(28) =823543a(29) =2470629